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Chapter 6 Sensitivity analysis: moisture effects Finally, first law efficiencies (Figure 6.16) grow in case of natural drying and decrease in the artificial one, roughly in equal measure as in the previous case both in absolute and relative terms. No drying, instead, denotes a little variation as regards GT EXT CER (compared to the corresponding moisture range, obviously), being characterised by a slight decrease in place of the substantial constancy previously found (-2% absolute and -2.5% relative), essentially due to higher electrical penalisation. In conclusion, the same remarks presented in the previous case can be proposed here as well: biomass drying, both artificial or natural, determines a plant performance improvement, while the use of wet biomass involves a thermodynamic penalisation. On the other hand, it is now necessary to verify that biomass drying is advantageous also from an economic point of view. 6.3.2 Economic analysis The economic analysis described in this section has been performed basing on the same hypotheses discussed in Chapter 5 (including the 2500 h heat sale period), except for two important parameters: biomass cost (still referring to raw material) and specific investment costs. Concerning the former, it is recalled that a cost of 60 €/t was assumed for the analysis. Nevertheless this value is valid for the reference moisture content, that is 8.7% (corresponding to a LHV equal to 16,784 kJ/kg). If then the latter varies, the biomass lower heating value, and thus its energy content, will vary accordingly too: in particular, increasing the former, it will decreases. Therefore it is not possible to adopt the same cost for all the considered moisture contents: for simplicity reasons, in this work it has been assumed to fix a direct proportionality between biomass cost and its lower heating value, starting from the aforementioned base values (Table 6.6 and Figure 6.17). Plant specific investment costs have been listed in Table 5.1. In particular, they are equal to 4000 €/kWel for GT EXT CER and 2700 €/kWel for ICE GAS. Those values include the dryer cost, as this device has been considered in all base configurations. On the other hand, in this analysis there are two scenarios (no drying and natural drying) where the dryer is not present, therefore its cost must be subtracted from the aforementioned values to obtain the investment costs in these two cases. In particular 214PDF Image | SMALL-SCALE BIOMASS POWER GENERATION
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